/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of Qt Designer.  This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//

#ifndef QDESIGNER_DNDITEM_P_H
#define QDESIGNER_DNDITEM_P_H

#include "shared_global_p.h"
#include <QtDesigner/abstractdnditem.h>

#include <QtCore/QList>
#include <QtCore/QMimeData>
#include <QtCore/QPoint>

QT_BEGIN_NAMESPACE

class QDrag;
class QImage;
class QDropEvent;

namespace qdesigner_internal
{

class QDESIGNER_SHARED_EXPORT QDesignerDnDItem : public QDesignerDnDItemInterface
{
public:
    explicit QDesignerDnDItem(DropType type, QWidget* source = 0);
    virtual ~QDesignerDnDItem();

    virtual DomUI* domUi() const;
    virtual QWidget* decoration() const;
    virtual QWidget* widget() const;
    virtual QPoint hotSpot() const;
    virtual QWidget* source() const;

    virtual DropType type() const;

protected:
    void setDomUi(DomUI* dom_ui);
    void init(DomUI* ui, QWidget* widget, QWidget* decoration, const QPoint& global_mouse_pos);

private:
    QWidget* m_source;
    const DropType m_type;
    const QPoint m_globalStartPos;
    DomUI* m_dom_ui;
    QWidget* m_widget;
    QWidget* m_decoration;
    QPoint m_hot_spot;

    Q_DISABLE_COPY(QDesignerDnDItem)
};

// Mime data for use with designer drag and drop operations.

class QDESIGNER_SHARED_EXPORT QDesignerMimeData : public QMimeData
{
    Q_OBJECT

public:
    typedef QList<QDesignerDnDItemInterface*> QDesignerDnDItems;

    virtual ~QDesignerMimeData();

    const QDesignerDnDItems& items() const { return m_items; }

    // Execute a drag and drop operation.
    static Qt::DropAction execDrag(const QDesignerDnDItems& items, QWidget* dragSource);

    QPoint hotSpot() const { return m_hotSpot; }

    // Move the decoration. Required for drops over form windows as the position
    // is derived from the decoration position.
    void moveDecoration(const QPoint& globalPos) const;

    // For a move operation, create the undo command sequence to remove
    // the widgets from the source form.
    static void removeMovedWidgetsFromSourceForm(const QDesignerDnDItems& items);

    // Accept an event with the proper action.
    void acceptEvent(QDropEvent* e) const;

    // Helper to accept an event with the desired action.
    static void acceptEventWithAction(Qt::DropAction desiredAction, QDropEvent* e);

private:
    QDesignerMimeData(const QDesignerDnDItems& items, QDrag* drag);
    Qt::DropAction proposedDropAction() const;

    static void setImageTransparency(QImage& image, int alpha);

    const QDesignerDnDItems m_items;
    QPoint m_globalStartPos;
    QPoint m_hotSpot;
};

} // namespace qdesigner_internal

QT_END_NAMESPACE

#endif // QDESIGNER_DNDITEM_P_H
